Foreign exchange rates and currency conversion JSON API. Get reliable current and historical exchange rate data. Fixer is a simple and lightweight API for current and historical foreign exchange (forex) rates. It provides real-time exchange rate data for 170 world currencies, updated every 60 seconds. Currency data is sourced from financial data providers and banks, including the European Central Bank. Historical exchange rate data is available all the way back to 1st January, 1999. The Fixer API comes with guaranteed availability, scalable volumes and responds within milliseconds.